Breast drill



AJune 21 1927. T J. FEGLEY ETAL BREAST DRILL Filed Nov. 25; 1925' ISU Patented June 21, 1927.

PA TENT foFFicE. g n

THOMAS J. FEGLEY AND GEORGE o. "'Lnorotn, oF rHILAnELrnIA, PENNSYLVANIA, AssreNons To Non'rHrBaos MTG.. oo., oF rnILAnELPHIA, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA, l

BREAST DRILL.

` Application led November 25, 1925. Serial No'. 71,446.

The object of our invention is to vso construct a breast drill ofthe change gear type that it will be compact andl simple in construction, the chuck being located close to the frame of the drill.l

In the accompanying drawing:

Fig. 1 is a View in elevation illustrating a breast drill without improved means for changing the speed of the spindle;

Fig. 2 is a vertical sectional view on the line 2-2, Fig. 1;

Fig. 8 is a1 sectional view on the line 3-8, Fig. 2;

Fig. 4 is a detached perspective view of the sliding shifter and spring;

Fig. 5 is a detached perspective view of the shifter sleeve; and

Fig. 6 is a detached perspective view of the coupling between the frame vand its.k handle.

The frame 1 of the drill has a central bearing 2, an upper bearing 3, and a lower bearing 4, the bearings being connected by bars 5 formed integral with the bearings. The frame in the present instance is a casting.v

Extending through the several bearings of the fraine is a spindle 6 having a chuck 7 of any .suitable type at its outer end. The chuck 7 is located close to the lower bearing 4 of the frame, and between the chuck and the bearing is a loose flanged anti-frictionring 8. Between this ring and the bearing are a series of balls 8a. Near the inner end of the spindle 6 is an annular groove 9, shaped to receive a segmental key 10, fitting a slot 11 in an extension 12 of the frame.

. The key is held in place by a screw-threaded sleeve 13, which is confined to the ferrule 14 of the handle 15 by a split ring 16 located in an annular groove in the ferrule. -The ferrule 14 is cut away to form a recess for a segmental portion of the extension 12 of the frame, so that when the parts are assenibled,the handle is held from turning on the frame.

On a stud 17, projecting Vat a right angle from the central bearing 2, is a bevel gearwheel 18, which has a. series of teeth 19 at its periphery. Attached tothe gear-wheel 18 is a handle 21. The handle is adapted to a groove 22 in the hub of the wheel and is located between two lugs v23, being held in position by a screw 24.

The gear-wheel is confined tothe spindle by a washer 25 and a screw 26. Secured to the gear-wheel 18 is a secondgear-wheel 20, less in dia-meter thanthe wheel 18. The hub of the gear-wheelf20 extends into the hub of the gear-wheel 18 and is keyed thereto. On the spindle 6 between the bearings 2 and 4 are two bevel gear-wheels 27 and 28. The gear-wheel 27 meshes with the teeth of the bevel gear-wheel 18, and the gearwheel 28 meshes withthe small bevel gearwheel 20.

The spindle hask af longitudinal groove 29 therein, as shown in Fig. 2, and ea'ch bevel gear-wheel 27 and 28 has 'a pair of keyways 27a-272L and281-282 one of eitherl pair of which can be brought into alignment with the groove in the spindle.

In the groove 29 is an elongated vshifting key 80, having a projection 31 arranged to enter keyway in either one -of the two gear-wheels' 27 or 28. The shifting key 30 1s notched at the back toreceive a spring 32,

which tends toforce the key into one or the other of the keyways in the gear-wheels.

- Projecting from the inner end of the shifting key is a lug 33 which extends into an opening in a shifting sleeve 34 arranged to slide on t-he spindle. This sleeve has a flange 35 by which it can be readily shifted. This shifting sleeve 34 is located in the space between the bearings 3 and 4 and is protected by the bearings and the side bars.

l/Vhen the shifter sleeve and itskey are in the position shown in Fig. 2, the gear-wheel 28 is keyed to the spindle, and the spindle -is driven at slow speed from the gear-wheel 20, the gear-wheel 27 running loose on the spindle.

vWhen the shifter is Inovedtowards the bearing 2, the key engages the gear-wheel 27. freeing the gear-wheel 28, andthe spindle 6 is driven at high speed through the gearteeth 19 on the gear-wheel 18 andthe bevel gear-wheel 27. f f

By locating the shifter sleeve within the aov frame as shown, the drill is made more cornpact than heretofore, and the chuck has a direct bearing on the lframe through the ball-bearing ring. l 1

We claim 1. The combination in a breast drill, of a frame having bearings for the drilling mechanism; a spindle mounted in said bearings, said spindle having an annular groove at the inner end; a segmental recess in thel frame; a

adapted 'to an external' thread" onj'the trarne;` and av split-ringloeated rn the' groove in' the handle having, a errule. out away to it the segmental recess; a segmental key'y located in the frame and extending into the annular groove in the spindle; a threaded sleeve ierrule of the handle, the sleeve fitting over the ring and acting to retain the handleto the frame and lool; the key, through the niediurn of the ferrule, tothe spindle.;

2. The combination, in a drill, of a franie having bearings forfthe drilling mechanism a spindle mounted.. in the bear-inge and having:- an annnl'argroove atene end, said frame having a. threaded portion. at .one end, Said threaded portionhaving anfsegrnental izeeevse,

said frame also having a tubular extension segmental portion of the frame; andvrneans for retaining the handle to the traine, the

f handlefretaining\.thehey in the groove of the Spindle.

THOMAS J'. FireGL-Ev. 1 GEORGE o. Lnororn 

